drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/idle.fuc

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/idle.fuc

File Facts

System: Linux kernel
Corpus path: drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/idle.fuc
Extension: .fuc
Size: 2527 bytes
Lines: 85
Domain: Driver Families
Bucket: drivers/gpu
Inferred role: Driver Families: drivers/gpu
Status: atlas-only

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#ifdef INCLUDE_PROC
process(PROC_IDLE, #idle, #idle_recv)
#endif

/******************************************************************************
 * IDLE data segment
 *****************************************************************************/
#ifdef INCLUDE_DATA
#endif

/******************************************************************************
 * IDLE code segment
 *****************************************************************************/
#ifdef INCLUDE_CODE
// description
//
// $r15 - current (idle)
// $r14 - message
// $r0  - zero
idle_recv:
	ret

// description
//
// $r15 - current (idle)
// $r0  - zero
idle:
	// set our "no interrupt has occurred during our execution" flag
	bset $flags $p0

	// count IDLE invocations for debugging purposes
	nv_iord($r1, NV_PPWR_DSCRATCH(1))
	add b32 $r1 1
	nv_iowr(NV_PPWR_DSCRATCH(1), $r1)

	// keep looping while there's pending messages for any process
	idle_loop:
	mov $r1 #proc_list_head
	bclr $flags $p2
	idle_proc:
		// process the process' messages until there's none left
		idle_proc_exec:
			push $r1
			mov b32 $r14 $r1
			call(recv)
			pop $r1
			bra not $p1 #idle_proc_next
			bset $flags $p2
			bra #idle_proc_exec
		// next process!
		idle_proc_next:
		add b32 $r1 #proc_size
		cmp b32 $r1 $r15
		bra ne #idle_proc
	bra $p2 #idle_loop

	// sleep if no interrupts have occurred
	sleep $p0
	bra #idle
#endif

Annotation

Atlas domain: Driver Families / drivers/gpu.
Implementation status: atlas-only.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.